Magnetically pigmented paint

ABSTRACT

A MAGNETIC PAINT FORMULATION THAT MAY BE APPLIED TO METAL SURFAC ESPECIALLY SUCH SURFACES WHEN IMMERSED IN A BODY OF FLUID. THE MAGNETIC INGREDIENT OF THE COMPOSITION IS A MAGNETIC IRON OXIDE AND WHEN ATTRACTED TO A MAGNETIZED METAL MATERIAL, THE PAINT IS INTIMATELY DRAWN ONTO THE SURFACE THEREOF. THE PAINT COMPARATIVELY CONTAINS LITTLE SOLVENT FOR UNDERWATER USE.

United States Patent 3,766,074 MAGNETICALLY PIGMENTED PAINT Carl V. Brouillette, Oxnard, Calif., assignor to the United States of America as represented by the Secretary of 1 theNavy No Drawing. FiledSept. 15, 1972, Ser. No. 289,529 Int. Cl. H0115 1/113 U.S. Cl. 252- 6254 4 Claims ABSTRACT OF THE DISCLOSURE A magnetic paint formulation that may be applied to metal surfaces especially such surfaces when immersed in a body of fluid. The magnetic ingredient of the composition is a magnetic iron oxide and when attracted to a magnetized metal material, the paint is intimately drawn onto the surface thereof. The paint comparatively contains little solvent for underwater use.

BACKGROUND OF THE INVENTION 7 (1) Field of the invention This invention relates to paint formulations capable of .being employedon magnetized underwater metal surfaces.

(2) Description of the prior art 'Attempts to apply paint to iron or steel surfaces under problems and will permit the application of a paint against underwater metal surfaces.

SUMMARY OF THE INVENTION This invention is concerned with a paint formulation 'thatmay' be applied" below water to magnetized ferrometal surfaces. The characteristic permitting underwater painting is imparted to the formulation by the addition of iron particles (50 microns or less) and the reduction of the solvent content thereof.

A primary object ofthe invention is to provide a paint formulation capable of being utilized on underwater magnetized ferrometalsurfaces.

Another object is to provide a paint formulation intimately attracted to a magnetized 'ferrometal surface which is thereby drawn into all pits and cracks.

Stillanother object is to provide a method of painting underwater ferrometal' surfaces. 7

Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention.

DESCRIPTION OF THE PREFERRE EMBODIMENT This invention involves a novel'paint formulation that maybe applied to metal surfaces either above or below a' fluid'surface =Howeve'r, it is especially applicable to underwater magnetized ferrometal surfaces. The magnetizable pigmentation will give the paint magnetic properties which will accordingly be attracted to a magnetized metal surface where it is intimately drawn into all cracks and pits. After being brushed or otherwise applied to a magnetized underwater metal surface, the paint will continue to cling, completely cure and become Well bonded even after the magnetism has been lost from the metal surface. The magnetic pull produced by the magnetized ferrometal surface will cause all air bubbles to be squeezed to the surface of the paint which will leave a pin hole-free paint film.

It is stressed that the present paint formulations must be nearly 100 percent solids containing proportionately little solvent. Also these paint formulations contain a curing agent which is mixed with the paint prior to application. The magnetic iron oxide is the magnetic ingredient of each formulation. The following formulations are of the coal-tar or epoxy variety, however, other types including polyester could also be employed in the concept if necessary.

FORMULA I.COMPOSITIONCOALTAR EPOXY 1 Softening -oint of tar 50-60 0. having an insoluble content (free carbon) of 1020%.

2 See Table II, epoxide.

See Table II, magnetic iron oxide.

FORMULA II.OOMPOSITIONEPOXY Percent by Pounds Gallons weight Component A-Materia1:

Epoxide resin 1 non-vol) 500 51. 6 29. 4 e a 400 5. 4 25. 0 China clay 210 9. 7 12. 5 Silica 320 10. 7 18. 7 Magnetic iron oxide 170 5. 6 10. 0 Xylene 78 11. 1 4. 4

Total 1, 678 102. O 99. 9

Component B-Curing agent:

Di-ethylene tri-amine 41 5. 1 42 Xylene 56 7. 5 53 Total 97 12. 6

1 Epoxide; average molecular Weight 450; epoxy equivalent (WPE) 225-290; specific gravity 1.5551.170.

2 China clay; specific gravity 2.6, ASTM deslgnatlon D603.

3 Silica, pulverized (MIL-S-15192A, Amend 1).

4 Magnetic iron oxide (e.g., magnafiux dry concentrate 90 red).

The paint is prepared for brush application by mixing Components A and B thoroughly, and allowing an induction period of 20 minutes before brush applying. The mixing ratio for A and B is as shown in Formula I and Formula II; for the coal-tar epoxy of Formula I, 1196 parts by weight of A with 43 parts by weight of B; similarly for epoxy of Formula II, 1678 parts by weight of A with 97 parts by weight of B. 1

It is to be noted that the weight of magnetic pigmentation can vary but the amount shown in the formulas is sufficient to produce the desired attraction.

'Thus, it should *be clear that any quantity of components A and B of both formulation I and II may 'be mixed provided the same ratio is used; 1196 parts by weight of A with 43 parts by weight of B in Formula I and 1678 parts by weight of A with 97 parts by weight of B in Formula II.

Obviously, many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. A magnetic paint formulation for underwater application to magnetized ferrometal surfaces comprising:

(a) Component A, consisting of Percent by Material Pounds Gallons weight Magnesium silicate 200 8. 6 16. 7 Synthetic silica 35 2.0 2. 9 Tar, at 75% solids, having a. softening point of 50-60 0., and an insoluble content of tree carbon of 1020% 500 51. 5 41.8 Epoxide resin, 90% non-vol, having an average molecular weight of 450, an epoxy equivalent of 225-290 WPE and specific gravity of 1.5551.170 275 28. 9 23. Magnetic iron oxide 120 2. 9 10. 0 Xylene 66 9. 1 5.

Total 1, 196 103.0 99. 9

(b) Component B, consisting of:

Percent by Curing agent Pounds Gallons weight Tetraethylene pentamine 25 3. 00 58 Xylene r 18 2.46 42 Total 43 5. 5 100 (c) Components A and B being thoroughly mixed prior to utilization. 2. A magnetic paint formulation for underwater application to magnetized ferrometal surfaces comprising:

(a) Component A, consisting of:

Percent by Material Pounds Gallons weight Epoxlde resin, 90% non-vol, having an average molecular weight of 450, an epoxy equivalent of 225-290 WPE and specific gravity of 1.5551.170 500 51.5 29.4 Red lead 400 5. 4 25.0 China clay, having a specific gravity of 2.6 and ASTM designation D603... 210 9. 7 12. 5 Silica, pulverized. 320 10. 7 18. 7 Magnetic iron oxide. 170 5. 6 10. 0 Xylene 78 11. 1 4. 4

Total...:...:. 1,078 102.0 99.9

(b) Component B, consisting of:

Percent by Curing agent Pounds Gallons weight Dl-ethylene trl-amine 41 5.1 42 Xylene 56 7. 5 58 (c) Components A and B being thoroughly mixed prior to utilization.

3. The process of the underwater painting of magnetized ferrometal surfaces comprising:

(a) preparing a magnetic paint formulation consisting (1) Component A, composed of:

Percent by Material Pounds Gallons weight Magnesium silicate. 200 8.6 16.7 Synthetic silica.. 35 2. 0 2. 9 Tar, at 75% solid ning point of 5060 C. and an insoluble content of free carbon 01 -20% 500 51. 5 41. 8 Epoxide resin, 90% non-vol, having an average molecular weight of 450, an epoxy equivalent of 225-290 WPE, and specific gravity of 1.5551.170..... 275 28. 9 23.0 Magnetic iron oxide 120 2. 9 l0. 0 Xylene 66 9. 1 5. 5

Total l, 196 103.0 99. 9

actual underwater use thereof; (0) magnetizing the underwater ferrometal surface intended to be painted; and i (d) painting said magnetized surface with said formulation. 4. The process of underwater painting magnetized ferrometal surfaces comprising:

(a) fpreparing a magnetic paint formulation consisting (1) Component A, composed of:

Percent by Material Pounds Gallons weight Epoxide resin, non-vol, having an average molecular weight of 450, an epoxy equivalent of 225-290 WPE, and specific gravity of 1.5551.170 500 51. 5 '29. 4 ed lead 400 5.4 25.0 China clay, having a specific gr of 2.6 and ASTM designation D603. 210 9. 7 12.5 Silica, pulverized 320 10.7 18. 7 Magnetic iron oxide- 170 5. 6 10. 0 Xylene 78 p 11.1 4. 4

Total 1, 678 102. 0 99. 9

(2) Component B, composed of:

Percent by Curing agent Pounds Gallons weight Di-ethylene tri-amine- 41 5. 1 42 Xylene 56 7. 5 58 (b) mixing Components A and B thoroughly prior to actual underwater utilization; I (c) magnetizing the underwater ferromctal surface to be painted; and (d) painting said magnetized .surface ,with said formulation.

References Cited 7 UNITED STATES PATENTS 2,456,313 12/ 1948 Pratt 106-290 3,213,026 10/ 1965 Jordan et al. 252-6255 3,354,653 11/1967 Meijer et al. 106-281 R 3,383,345 5/1968 Bauer 260-33.6 EP 3,582,367 1/ 1971 Miller et al. 106-281 3,639,344 l/ 1972 Kinneman et al. 260-28 3,709,730 l/1973 Tsukamoto 252-6254 DANIEL E. WYMAN, Primary Examiner. A. P. DEMERS, Assistant Examiner US. Cl. X.R. 

